Controller for electric motors.



No. 678,989. Patented July 23, l90l.

E. w. STULL. CONTROLLER FOB ELECTRIC MOTORS.

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EMMETT W. STULL, OF JOHNSTOWN, PENNSYLVANIA, ASSIGNOR TO THE LORAINSTEEL COMPANY, OF PENNSYLVANIA.

CONTROLLER FOR ELECTRIC MOTORS.

SPECIFICATION forming part of Letters Patent No. 678,989, dated July 23,1901. Application filed September 28, 1900. Serial No. 31,427. (Nomodel.)

To ctZZ whom it may concern:

Be it known that I, EMMETT W. STULL, of Johnstown, in the county ofCambria and State of Pennsylvania, have invented a new andusefulImprovement in Controllers for Electric Motors, of which the followingis a full, clear, and exact description, reference being had to theaccompanying drawings, which form a part of this specification.

My invention has relation to controllers for electric motors, and moreparticularly to operating devices therefor, my object being to providemeans whereby the handle of the regulating-switch cannot be removed fromsaid switch unless both the regulating and reverse switches have beenfirst moved to off position.

My invention consists in the combination, with a regulating andreversing switch and independent operating-handles therefor, of meanswhereby the handle of the regulatingswitch cannot be removed unless thesaid switch is at off position, and,in addition thereto, of other meanswhereby said handle cannot be removed at all unless the reversing-switchis also at its off position.

My invention further consists in the novel construction, arrangement,and combination of parts, all substantially as hereinafter described,and pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a plan view of the top of amotor-controller embodying my invention, the top of the easing beingpartly broken away; and Fig 2 is a vertical section of the same, takenon the line 2 2 of Fig. 1.

A designates the controller-casing, B the shaft of the usualregulating-switch, and O the shaft of the reversing-switch.

D is the handle of the regulating-switch, and E the handle of thereversing-switch, said handles having the usual hub portions withsquared portions, which detachably engage the squared upper end portionsof the respective switchshafts.

The top of the controller-casing is formed with a circular raisedhorizontal flange F, underneath which moves a depending inturned lug Dof the handle D, said flange and lug forming means whereby said handlecannot be applied or removed except when in a position where the lugregisters with a slot in the flange F. When the handle is at thisposition, the regulating-switch is at its open circuit or off position.

G is a sleeve which loosely surrounds the upper portion of the shaft Band terminates at its upper end in a water-guard portion 9, which fitsover a raised boss (1 on the controller-top around the shaft-opening.This portion 9 is formed with an extension 9, which rests on the flangeF and is of sufficient width to cover the slot f. Connected to the lowerend of said sleeve is a link H, whose opposite end is connected to apivoted follower-arm I, whose free end bears against a cam J on theshaft 0. Said cam has a high portion j, which is properly positioned toimpinge the follower when the reverse-switch is at its off position. Acompression-spring K moves said follower in the opposite direction whenit is released by the said high portion of the cam. In the presentinstance I have shown the cam as being carried by the usual notch orindex plate; but this is immaterial to my invention, which includes anymeans controlled by the movement of the shaft 0 for operating the sleeveG.

The operation will be readily understood. Normally the sleeve G is insuch position that the extension 9 closes the slot f, and therebyprevents removal of the handle D. When the reverse-switch is moved tooff position, however, the cam J actuates the said sleeve through theconnecting-link II to move the said extension to the position shown infull lines in Fig. 1, and thereby'uncover the said slot. In order toprevent the sleeve G from being withdrawn, its lower end is providedwith a collar P, held by a set-screw 9'. By thus compelling the motormanto bring both switches to off position before he can remove the handleof the regulating-switch I prevent said switches from being left inimproper position when the motorman leaves the car or takes off thehandles and goes from one end of the car to the other.

I do not limit myself to the use of the particular mechanical deviceswhich I have herecasing, a handle for the regulating-switch, a

slotted guard-flange on said casing for preventing the removal of saidhandle except at the oft position of its switch, and means controlled bythe reverse-switch for preventing the removal of said handle at any timeunless the reverse-switch be at its off position.

2. In a controller for electric motors, the combination with a casing",a regulatingswitch journaled therein, a reverse-switch carried by anindependent shaft also journaled in said casing to one side of theregulating-switch, a handle for the regulatingswitch, and meanscontrolled by the reversing-switch whereby said handle can be removedonly when the reversing-switch is at its off position.

3. In a controller for electric motors, the combination of a casing, aregulatingswitch journaled therein, a removable handle for said switch,a slotted guard-flange engaged by said handle and preventing its removalexcept when the switch is at off position, a

device for closing the slot of said flange, a reverse-switch alsojonrnaled in said casing upon an independent shaft, and an operativeconnection between the reverse-switch shaft and the device for closingthe said slot.

4:. In a controller for electric motors, the combination of a casing, aregulating-switch journaled therein, a handle for said switch, aguard-flange on the casing engaged by said handle and preventing itsremoval except at the off position of the said switch, an auxiliaryguard device sleeved on the shaft of said switch, a reverse-switch alsojonrnaledin said casing upon an independent shaft, and cam meansoperated by the reverse-switch for con trolling the movement of saidauxiliary guard device.

5. In a controller, the combination of the casing having a slottedgnard-ilange, a regulating-switch, a handle for said switch having anengagement with the said flange, a sleeve mounted on the shaft of saidswitch to have an independent rotary movement and having an extensionarranged to close the said slot, a reverse-switch,a cam carried thereby,and a device impinging the said cam and connected to said sleeve.

In testimony whereof I have affixed my signature in presence of twowitnesses.

- EMMETT XV. STULL.

W'itnesses:

BLANOHE M. SMITH, H. W. SMITH.

